#include<bits/stdc++.h>
using namespace std;
struct time_helper{
#ifdef LOCAL
clock_t time_last;time_helper(){time_last=clock();}void test(){auto time_now=clock();std::cerr<<"time:"<<1.*(time_now-time_last)/CLOCKS_PER_SEC<<";all_time:"<<1.*time_now/CLOCKS_PER_SEC<<std::endl;time_last=time_now;}~time_helper(){test();}
#else
void test(){}
#endif
}time_helper;
#ifdef LOCAL
#include"dbg.h"
#else
#define dbg(...) (__VA_ARGS__)
#endif
namespace Fread{const int SIZE=1<<16;char buf[SIZE],*S,*T;inline char getchar(){if(S==T){T=(S=buf)+fread(buf,1,SIZE,stdin);if(S==T)return'\n';}return *S++;}}namespace Fwrite{const int SIZE=1<<16;char buf[SIZE],*S=buf,*T=buf+SIZE;inline void flush(){fwrite(buf,1,S-buf,stdout);S=buf;}inline void putchar(char c){*S++=c;if(S==T)flush();}struct NTR{~NTR(){flush();}}ztr;}
#define getchar Fread::getchar
#define putchar Fwrite::putchar
int print_precision=10;bool print_T_endl=1;char print_between=' ';
template<typename T>struct is_char{static constexpr bool value=(std::is_same<T,char>::value||std::is_same<T,signed char>::value||std::is_same<T,unsigned char>::value);};template<typename T>struct is_integral_ex{static constexpr bool value=(std::is_integral<T>::value||std::is_same<T,__int128>::value)&&!is_char<T>::value;};template<typename T>struct is_floating_point_ex{static constexpr bool value=std::is_floating_point<T>::value||std::is_same<T,__float128>::value;};namespace Fastio{struct Reader;struct Writer;template<size_t id>struct read_tuple{template<typename...T>static void read(Reader&stream,std::tuple<T...>&x){read_tuple<id-1>::read(stream,x);stream>>get<id-1>(x);}};template<>struct read_tuple<0>{template<typename...T>static void read([[maybe_unused]]Reader&stream,[[maybe_unused]]std::tuple<T...>&x){}};template<size_t id>struct print_tuple{template<typename...T>static void print(Writer&stream,const std::tuple<T...>&x){print_tuple<id-1>::print(stream,x);putchar(print_between);stream<<get<id-1>(x);}};template<>struct print_tuple<1>{template<typename...T>static void print(Writer&stream,const std::tuple<T...>&x){stream<<get<0>(x);}};template<>struct print_tuple<0>{template<typename...T>static void print([[maybe_unused]]Writer&stream,[[maybe_unused]]const std::tuple<T...>&x){}};
struct Reader{template<typename T>typename std::enable_if_t<std::is_class<T>::value,Reader&>operator>>(T&x){for(auto &y:x)*this>>y;return *this;}template<typename...T>Reader&operator>>(std::tuple<T...>&x){read_tuple<sizeof...(T)>::read(*this,x);return *this;}template<typename T>typename std::enable_if_t<is_integral_ex<T>::value,Reader&>operator>>(T&x){char c=getchar();short f=1;while(c<'0'||c>'9'){if(c=='-')f*=-1;c=getchar();}x=0;while(c>='0'&&c<='9'){x=(x<<1)+(x<<3)+(c^48);c=getchar();}x*=f;return *this;}template<typename T>typename std::enable_if_t<is_floating_point_ex<T>::value,Reader&>operator>>(T&x){char c=getchar();short f=1,s=0;x=0;T t=0;while((c<'0'||c>'9')&&c!='.'){if(c=='-')f*=-1;c=getchar();}while(c>='0'&&c<='9'&&c!='.')x=x*10+(c^48),c=getchar();if(c=='.')c=getchar();else return x*=f,*this;while(c>='0'&&c<='9')t=t*10+(c^48),s++,c=getchar();while(s--)t/=10.0;x=(x+t)*f;return*this;}template<typename T>typename std::enable_if_t<is_char<T>::value,Reader&>operator>>(T&c){c=getchar();while(c=='\n'||c==' '||c=='\r')c=getchar();return *this;}Reader&operator>>(char*str){int len=0;char c=getchar();while(c=='\n'||c==' '||c=='\r')c=getchar();while(c!='\n'&&c!=' '&&c!='\r')str[len++]=c,c=getchar();str[len]='\0';return*this;}template<typename T1,typename T2>Reader&operator>>(std::pair<T1,T2>&x){*this>>x.first>>x.second;return *this;}Reader&operator>>(std::string&str){str.clear();char c=getchar();while(c=='\n'||c==' '||c=='\r')c=getchar();while(c!='\n'&&c!=' '&&c!='\r')str.push_back(c),c=getchar();return*this;}Reader(){}}cin;const char endl='\n';
struct Writer{typedef __int128 mxdouble;template<typename T>typename std::enable_if_t<std::is_class<T>::value,Writer&>operator<<(const T&x){for(auto q:x){*this<<q;if(!is_class<decltype(q)>::value)*this<<print_between;}if(!is_class<typename T::value_type>::value&&print_T_endl)*this<<'\n';return *this;}template<typename...T>Writer&operator<<(const std::tuple<T...>&x){print_tuple<sizeof...(T)>::print(*this,x);if(print_T_endl)*this<<'\n';return *this;}template<typename T>typename std::enable_if_t<is_integral_ex<T>::value,Writer&>operator<<(T x){if(x==0)return putchar('0'),*this;if(x<0)putchar('-'),x=-x;static int sta[45];int top=0;while(x)sta[++top]=x%10,x/=10;while(top)putchar(sta[top]+'0'),--top;return*this;}template<typename T>typename std::enable_if_t<is_floating_point_ex<T>::value,Writer&>operator<<(T x){if(x<0)putchar('-'),x=-x;x+=pow(10,-print_precision)/2;mxdouble _=x;x-=(T)_;static int sta[45];int top=0;while(_)sta[++top]=_%10,_/=10;if(!top)putchar('0');while(top)putchar(sta[top]+'0'),--top;putchar('.');for(int i=0;i<print_precision;i++)x*=10;_=x;while(_)sta[++top]=_%10,_/=10;for(int i=0;i<print_precision-top;i++)putchar('0');while(top)putchar(sta[top]+'0'),--top;return*this;}template<typename T>typename std::enable_if_t<is_char<T>::value,Writer&>operator<<(const T&c){putchar(c);return*this;}Writer&operator<<(char*str){int cur=0;while(str[cur])putchar(str[cur++]);return *this;}Writer&operator<<(const char*str){int cur=0;while(str[cur])putchar(str[cur++]);return*this;}template<typename T1,typename T2>Writer&operator<<(const std::pair<T1,T2>&x){*this<<x.first<<print_between<<x.second;if(print_T_endl)*this<<'\n';return *this;}Writer&operator<<(const std::string&str){int st=0,ed=str.size();while(st<ed)putchar(str[st++]);return*this;}Writer(){}}cout;}
#define cin Fastio::cin
#define cout Fastio::cout
#define endl Fastio::endl
template<class Fun>class y_combinator_result{Fun fun_;public:template<class T>explicit y_combinator_result(T &&fun): fun_(std::forward<T>(fun)) {}template<class ...Args>decltype(auto) operator()(Args &&...args){return fun_(std::ref(*this), std::forward<Args>(args)...);}};template<class Fun>decltype(auto) y_combinator(Fun &&fun){return y_combinator_result<std::decay_t<Fun>>(std::forward<Fun>(fun));}

void init();void solve(int tc);
main()
{
    init();int t=1;
    // cin>>t;
    for(int tc=1;tc<=t;tc++)solve(tc);
}
void init()
{
}
template<int N>
struct DINIC
{
    constexpr static long long inf=1e18;
    vector<int>e[N+1],to;
    long long dis[N+1];int arc[N+1];
    vector<long long>flow;
    int ec=0;
    void adde(int u,int v,long long f)
    {
        e[u].emplace_back(ec++);to.emplace_back(v),flow.emplace_back(f);
        e[v].emplace_back(ec++);to.emplace_back(u),flow.emplace_back(0);
    }
    void clear()
    {
        flow.clear();
        to.clear();
        for(int x=0;x<=N;x++)
        e[x].clear(),dis[x]=arc[x]=0;
        ec=0;
    }
    bool bfs(int S,int T)
    {
        fill(dis,dis+N+1,inf);
        queue<int>q;
        dis[S]=0;
        q.push(S);
        while(!q.empty())
        {
            int u=q.front();
            if(u==T)return 1;
            q.pop();
            for(auto id:e[u])
            if(flow[id])
            {
                int v=to[id];
                if(dis[v]>dis[u]+1)
                {
                    dis[v]=dis[u]+1;
                    q.push(v);
                }
            }
        }
        return 0;
    }
    long long dfs(int S,int T,long long lim)
    {
        if(S==T)return lim;
        long long res=0;
        for(auto &i=arc[S];i<e[S].size();i++)
        {
            int id=e[S][i];
            if(!flow[id]||dis[to[id]]!=dis[S]+1)continue;
            long long nw=dfs(to[id],T,min(lim,flow[id]));
            res+=nw;
            flow[id]-=nw;
            flow[id^1]+=nw;
            lim-=nw;
            if(lim==0)break;
        }
        return res;
    }
    long long dinic(int S,int T)
    {
        long long res=0;
        while(bfs(S,T))
        {
            memset(arc,0,sizeof(arc));
            res+=dfs(S,T,inf);
        }
        return res;
    }
};
DINIC<5002>d;
void solve([[maybe_unused]]int tc)
{
    int n,m,l;
    cin>>n>>m>>l;
    vector<vector<vector<char>>>c(l,vector<vector<char>>(n,vector<char>(m)));
    vector<vector<vector<int>>>w(l,vector<vector<int>>(n,vector<int>(m)));
    cin>>c>>w;
    int ans0=0;
    if(c[0][0][0]=='W')ans0+=w[0][0][0],c[0][0][0]='B';
    if(c[l-1][n-1][m-1]=='B')ans0+=w[l-1][n-1][m-1],c[l-1][n-1][m-1]='W';
    w[0][0][0]=w[l-1][n-1][m-1]=d.inf;
    int S=l*n*m,T=S+1;
    for(int x=0;x<l;x++)
    for(int y=0;y<n;y++)
    for(int z=0;z<m;z++)
    {
        if(c[x][y][z]=='W')d.adde(x*n*m+y*m+z,T,w[x][y][z]);
        else d.adde(S,x*n*m+y*m+z,w[x][y][z]);
        if(x)d.adde(x*n*m+y*m+z,x*n*m+y*m+z-n*m,d.inf);
        if(y)d.adde(x*n*m+y*m+z,x*n*m+y*m+z-m,d.inf);
        if(z)d.adde(x*n*m+y*m+z,x*n*m+y*m+z-1,d.inf);
    }
    cout<<ans0+d.dinic(S,T)<<endl;
}